ZC and pg7 ecu not starting!!!!

So I've got a 91 crx hf with a jdm dohc zc swap and I've been running the stock Si ecu for awhile and just went out and bought an ecu out of a 89 Integra 5 speed. Should plug and play, right? Well I plugged it all in and my car wont turn over at all. Plug the si ecu back in and it runs fine. WTF.